i need help answering these questionplease show all the steps don’t skip any…………………Homework #10: Applications of Newton’s laws in 1D
Instructions: Answer the following force and motion questions. Show your work clearly, including a
description or drawing of your coordinate system (origin, positive directions for x & y). Start with a
general physics equation, solve it using symbols, and put the numbers in at the very end. Write your
final answers with the correct number of significant figures.
1. A 32.5-kg box sitting at rest on a horizontal floor is acted on by a net horizontal force of 14.0 N.
a. What is the magnitude of its acceleration?
b. How far does it travel in 10.0 seconds?
c. What is its speed at that time?
2. A hockey puck with mass 0.160 kg is at rest at the origin (x = 0) on the horizontal, frictionless surface
of an ice rink. At time t = 0 a player applies a force of 0.250 N on the puck, parallel to the x-axis. She
continues to apply this force until t = 2.00 s. What are the position and speed of the puck at
t = 2.00 s?
3. An old phrase used to sell cars was that they could “stop on a dime,” meaning they could stop
before the car had moved a distance equal to the diameter of a dime.
a. To see if this is realistic, calculate the net force needed to stop a 750-kg car moving at 35
miles/hour in a distance of 1.8 cm (the diameter of a dime).
b. Compare that force to the weight of the car. Based on your comparison, is “stopping on a
dime” a reasonable claim?
c. Calculate how much time it would take the car to stop. Is this a reasonable time for a car
moving at 35 mph to stop?
4. The horizontal position of a 4900-N car driving down a long, flat, straight road is given by the following
formula, where t is measured in seconds.
( ) = (3.6 / 3 ) 3 − �4.8 2 � 2
a.
b.
c.
d.
What is the car’s mass?
What is the x-component of the car’s velocity, as a function of time?
What is the x-component of the car’s acceleration, as a function of time?
What is the x-component of the net force acting on the car at time t = 2.0 s?
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